Abstract

Modeling the field produced by a point-like dipole with an arbitrary location in the presence of a rotationally invariant nanostructure is an important issue in the context of designing nanoantennas. This is a challenging problem, as rotational symmetry is broken when introducing a noncentered dipole. Antennas larger than the wavelength are required for directivity, whereas the dipole–antenna distance is highly subwavelength, so there are two different length scales in the problem. In this paper, we introduce an original S-matrix approach based on an aperiodic-Fourier modal method. The potential of the technique is illustrated by considering three examples. We compare our results with a finite element technique.

References

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Table 1.

aL=0,…,9 to the total power emitted by a λ/2 off-centered dipole source in vacuum, polarized in the z direction. PemittedL includes the contributions of L and −L. Calculations were carried out with 2N+1=301 Fourier terms.